Question about 1991 Cadillac DeVille
My 1991 cadillac devile(4.9) runs great when cold,but after it warms up it starts to run rough. No engine lights come on dash indicating a problem. I have also changed the air and fuel filter. the car has 102k. miles.
I'd take a look at the temp sender...the engines computer may be
"thinking" the engine is still cold when it's not. That would cause it
run rich (and rough) after it's warmed up. Generally the sender can be
tested with an ordinary volt/ohmeter but you will need the
specifications available in most inexpensive manuals. As with any
complicated electronics system, I can only give you my best guess,
without the luxury of doing any hands-on testing myself.
Posted on May 28, 2009
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Posted on Jan 02, 2017
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